Dr. Jinzhou Li Profile

Dr. Jinzhou Li

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Proceedings Article | 18 March 2024 Paper

Experiment on protection performance of plasma array to 6GHz high-power microwave

Shouye Lv, Jinzhou Li, Gang Meng, Jiaming Shi, Shuai Liao, Yang Liu

Proceedings Volume 13104, 131040X (2024) https://doi.org/10.1117/12.3021652

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For purpose of the electromagnetic pulse (EMP) protection research, a double-layer barrier of cylindrical plasma array was designed, and its protective performance to 6GHz high-power microwave (HPM) was conducted experimentally. Combining the distribution of the discharge plasma array, the shielding effectiveness of the double-layer plasma on 6GHz HPM pulse was studied. The main research contents and conclusions are as follows: The transmission energy of HPM decreased as the increase of plasma electron density, indicating an improved protection effect, with both double-layer and single-layer plasma array. Besides, the results showed that the transmission attenuation of HPM in double-layer structure was greater than that in single-layer structure because of the interlayer reflection. In addition, an interesting phenomenon was discovered during the experiment, which was that the boundary plasma units had a significant impact on the HPM transmission. The shielding effect of HPM was better with opening seven plasma units than that with opening whole plasma array. Finally, the spectral characteristics and transmission coefficients of the HPM were presented by Fourier transform, and the results of the protective performance were consistent with the above-mentioned time-domain analysis. The experiment results in this paper are of great significance in protecting against HPM based on plasma.

Proceedings Article | 4 April 2023 Paper

Simulation analysis of the HPM propagation along the femtosecond laser plasma double-line

Jiaming Shi, Yan He, Shouye Lv, Xiaobin Li, Jinzhou Li, Yang Liu

Proceedings Volume 12617, 126173S (2023) https://doi.org/10.1117/12.2666127

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The transmission of High-Power Microwave (HPM) with a frequency of 1 GHz in a plasma double-line induced by intense femtosecond laser pulses is discussed by CST software. The influence of plasma electron density and collision frequency on HPM transmission performance is analyzed especially. The simulation results indicate that, the influence of plasma electron density on the transmission performance of HPM along the double-line is slight when the electron density is in the range of 10¹⁵ cm^-3 ~10¹⁷ cm^-3. It can also be obtained that the incident EM wave can propagate around the plasma double-line rather than in the over-dense plasma. We also discover that the attenuation value of the EM wave increases significantly with increasing the plasma collision frequency. Meanwhile, the attenuation value of the EM along the plasma transmission line can be calculated at approximately 0.94 dB/m and 1.56 dB/m when the plasma collision frequencies are 6×10⁹ Hz and 1.5×10¹¹ Hz, respectively. As can be seen, it is not necessary to increase the electron density of femtosecond laser plasma for achieving a high HPM transmission performance in the future applications.

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